屋外-屋内マルチパス伝搬環境におけるフェージング特性とその低減法 ...
屋外-屋内マルチパス伝搬環境におけるフェージング特性とその低減法 ...
屋外-屋内マルチパス伝搬環境におけるフェージング特性とその低減法 ...
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2008 Summary of Master’s Thesis<br />
A Research for Method of Mitigating and Multipath Fading Characteristic<br />
in Outdoor to Indoor Propagation Environment<br />
Department of Informatics, Kwansei Gakuin University<br />
Taga Laboratory, Keisuke Sanagi<br />
This thesis clears characteristics in outdoor to indoor propagation environment for<br />
improvement of the receiver performance in the indoor area. In addition, it proposes the<br />
method of mitigation for multipath fading and clears the effects of proposed method.<br />
At first, methods of estimated characteristic in outdoor to indoor propagation<br />
environment are Ray-Tracing method and Aperture-Field method as in the past. Author<br />
proposes Aperture-Division method which divides the aperture into plural sub-segments<br />
and verifies the effects of this method by comparing the results of computer simulation<br />
to measurements. As a result, estimation accuracy is improved for delay spread with<br />
this method when the width of sub-segments is 1λ.<br />
Next, this thesis shows the result of estimation of outdoor to indoor multipath<br />
propagation characteristics with proposed method and confirms that K-factor of the<br />
received power distribution around room walls is 0~4dB no matter what the incident<br />
angle and the size of room. It also indicates that delay spread is only 10~50nsec for<br />
room size (width, depth, height) = (6.6m, 9.6m, 2.7m), but it increases as the room size<br />
gets bigger.<br />
At final, this thesis proposes direction pattern diversity with 2-element ESPAR<br />
Antenna as the mitigating method for multipath fading. Each element is half-dipole<br />
which element length is λ/2. Control capacity of varactor diode in parasitic elements is<br />
1pF and 10pF. Diversity reception is considered using 2 radiation patterns. As a result,<br />
when antenna end-fire direction is adapted arrival angle of radio wave, K-factor of the<br />
received power distribution around walls increases 1~11dB.<br />
Keyword : Outdoor-Indoor Propagation, Multipath Environment, Fading Characteristic,<br />
Aperture-Division Method, ESPAR Antenna, Direction Pattern Diversity
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